The Medeci Furniture Raisers can be used for chairs, beds and tables with legs, as well as for armchairs and divan beds. The units adjust in height simply by turning the body relative to the base. The range of height adjustment for furniture with castors is 100mm to 176mm (4"" to 7""); while for furniture with legs that sit inside the cups, the effective height raise is between 50mm and 127mm (2"" to 5""). There is a guage marked on the side of the raiser for ease of use. The raisers secure to furniture with legs by rotating the top collar of the unit relative to the body, which tightens an internal strap around the leg. For fitment to furniture with castors one of two methods can be used, either by putting the universal castor adaptor around the castor and lowering it into the raiser, or by removing the castor from its socket and replacing it with the bobbin. Both accessories are included with each set of raisers. The raisers have a large enough base to ensure stability, though are unobtrusive when fitted. They are also incredibly strong and have a maximum weight rating of 500kg (78 stone). Internal diameter 70mm, diameter of base 150mm. Barcode: 5050996028453